Guys, I finally got around to checking my oil pressure with a mechanical guage today after the oil pressure alarm came on once more... the news is bad - the mech guage was reading 15-20 psi at idle when hot which I think is dangerously low. The problem I have is whether the problem is oil or oil pump... The pressure on cold start up and while driving normally seems to maintain around the 35-40psi mark. It seems to be when driving it hard and then idling it will drop down to the 15-20psi mark. Is this a symptom of poor oil (Magnatec 15w40) or a worn oil pump? I have tried thicker oil (20w50) and different brands but it doesn't make much difference. I would really appreciate some comments on this as I'm thinking this could be a rebuild on the way...

Theres certainly not enough noise in the engine to worry me in terms of big end knocking, it is slightly rattly on start-up for a brief second (still minimal though). The minute the lifters pump up its all good. Do the pressures seem abnormally low or not... ? The car has only done 152000kms which I don't think excessive at all.

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